1221100001022 has 16 divisors (see below), whose sum is σ = 2664218184192. Its totient is φ = 370030303320.

The previous prime is 1221100000997. The next prime is 1221100001029. The reversal of 1221100001022 is 2201000011221.

It is a junction number, because it is equal to n+sod(n) for n = 1221100000989 and 1221100001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221100001029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9250757518 + ... + 9250757649.

It is an arithmetic number, because the mean of its divisors is an integer number (166513636512).

Almost surely, 2^{1221100001022} is an apocalyptic number.

1221100001022 is an abundant number, since it is smaller than the sum of its proper divisors (1443118183170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221100001022 is a wasteful number, since it uses less digits than its factorization.

1221100001022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18501515183.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1221100001022 its reverse (2201000011221), we get a palindrome (3422100012243).

The spelling of 1221100001022 in words is "one trillion, two hundred twenty-one billion, one hundred million, one thousand, twenty-two".